Use two step conversion from float to uint8 to reduce platform dependence

[sclarkson]

Closes #8574

[pytorch-bot]

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✅ You can merge normally! (2 Unrelated Failures)

As of commit b6d16e6 with merge base db60022 ():

FLAKY - The following jobs failed but were likely due to flakiness present on trunk:

• Build Linux Conda / pytorch/vision / upload / conda-py3_9-cuda12_1 (gh) (detected as infra flaky with no log or failing log classifier)
• Tests / unittests-windows (3.9, windows.g5.4xlarge.nvidia.gpu, cuda, 11.8) / windows-job (gh) (detected as infra flaky with no log or failing log classifier)

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